Re: hwclock "hanging" for ~24 hours

[Karel Zak <kzak@xxxxxxxxxx>]

On Fri, Aug 08, 2008 at 10:14:33PM +0200, Tomasz Chmielewski wrote:
> open("/dev/rtc", O_RDONLY|O_LARGEFILE)  = 3
> ioctl(3, RTC_UIE_ON, 0)                 = -1 ENOTTY (Inappropriate ioctl for device)
> ioctl(3, RTC_RD_TIME, {tm_sec=0, tm_min=0, tm_hour=0, tm_mday=0, tm_mon=-1, tm_year=100, ...}) = 0
> ioctl(3, RTC_RD_TIME, {tm_sec=0, tm_min=0, tm_hour=0, tm_mday=0, tm_mon=-1, tm_year=100, ...}) = 0
> ioctl(3, RTC_RD_TIME, {tm_sec=0, tm_min=0, tm_hour=0, tm_mday=0, tm_mon=-1, tm_year=100, ...}) = 0
> ioctl(3, RTC_RD_TIME, {tm_sec=0, tm_min=0, tm_hour=0, tm_mday=0, tm_mon=-1, tm_year=100, ...}) = 0
> ioctl(3, RTC_RD_TIME, {tm_sec=0, tm_min=0, tm_hour=0, tm_mday=0, tm_mon=-1, tm_year=100, ...}) = 0
> ioctl(3, RTC_RD_TIME, {tm_sec=0, tm_min=0, tm_hour=0, tm_mday=0, tm_mon=-1, tm_year=100, ...}) = 0
> ioctl(3, RTC_RD_TIME, {tm_sec=0, tm_min=0, tm_hour=0, tm_mday=0, tm_mon=-1, tm_year=100, ...}) = 0
> ioctl(3, RTC_RD_TIME, {tm_sec=0, tm_min=0, tm_hour=0, tm_mday=0, tm_mon=-1, tm_year=100, ...}) = 0
> ioctl(3, RTC_RD_TIME, {tm_sec=0, tm_min=0, tm_hour=0, tm_mday=0, tm_mon=-1, tm_year=100, ...}) = 0
> ioctl(3, RTC_RD_TIME, {tm_sec=0, tm_min=0, tm_hour=0, tm_mday=0, tm_mon=-1, tm_year=100, ...}) = 0
> ioctl(3, RTC_RD_TIME, {tm_sec=0, tm_min=0, tm_hour=0, tm_mday=0, tm_mon=-1, tm_year=100, ...}) = 0
> ioctl(3, RTC_RD_TIME, {tm_sec=0, tm_min=0, tm_hour=0, tm_mday=0, tm_mon=-1, tm_year=100, ...}) = 0
> ioctl(3, RTC_RD_TIME, {tm_sec=0, tm_min=0, tm_hour=0, tm_mday=0, tm_mon=-1, tm_year=100, ...}) = 0
> ioctl(3, RTC_RD_TIME, {tm_sec=0, tm_min=0, tm_hour=0, tm_mday=0, tm_mon=-1, tm_year=100, ...}) = 0
> (...)

 Yeah, our synchronize_to_clock_tick() :-)


  hwclock/rtc.c, busywait_for_rtc_clock_tick():

  for (i = 0;
       (rc = do_rtc_read_ioctl(rtc_fd, &nowtime)) == 0
        && start_time.tm_sec == nowtime.tm_sec;
       i++)
    if (i >= 1000000) {
      fprintf(stderr, _("Timed out waiting for time change.\n"));
      return 2;
    }


    Karel

-- 
 Karel Zak  <kzak@xxxxxxxxxx>
--
To unsubscribe from this list: send the line "unsubscribe util-linux-ng" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html